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Related Experiment Videos

Stability of the mercaptobenzothiazole compounds

C Hansson1, G Agrup

  • 1Department of Occupational Dermatology, University of Lund, Sweden.

Contact Dermatitis
|January 1, 1993
PubMed
Summary

Chemical reactions in mercaptobenzothiazole (MBT) mix explain cross-sensitivities. Stability studies reveal 2-mercaptobenzothiazole is the main product, suggesting a single substance for patch testing.

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Area of Science:

  • Analytical Chemistry
  • Dermatology
  • Chemical Stability Studies

Background:

  • Mercaptobenzothiazole (MBT) derivatives are used in patch testing for hypersensitivity.
  • Reported cross-sensitivities within the MBT group suggest underlying chemical interactions.
  • Understanding the stability and transformation of MBT derivatives is crucial for accurate diagnosis.

Purpose of the Study:

  • To develop a quantitative HPLC method for determining MBT derivatives.
  • To investigate the stability of MBT derivatives in petrolatum and buffer solutions.
  • To elucidate the chemical reactions influencing MBT stability and their implications for patch testing.

Main Methods:

  • Development of a high-pressure liquid chromatography (HPLC) method for simultaneous determination of MBT derivatives.
  • Stability testing of MBT derivatives in petrolatum vehicle.
  • Stability testing of MBT derivatives in buffer solution at pH 6.5, with and without glutathione.

Main Results:

  • Dibenzothiazyl disulfide was the dominant compound in stored MBT mix in petrolatum.
  • In buffer, 2-mercaptobenzothiazole and sulfenamide derivatives converted to dibenzothiazyl disulfide.
  • Glutathione rapidly converted sulfenamides and dibenzothiazyl disulfide to 2-mercaptobenzothiazole.

Conclusions:

  • Chemical transformations of MBT derivatives explain observed cross-sensitivities in patch testing.
  • A single primary hapten, 2-mercaptobenzothiazole, is likely responsible for hypersensitivity reactions.
  • Revising patch testing protocols to use a single MBT substance is proposed for improved accuracy.

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